A MOPA with double-end pumped configuration using total internal reflection |
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| Authors: | You Wang Koichi Inoue Hirofumi Kan Takayo Ogawa and Satoshi Wada |
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| Institution: | 1.Central Research Laboratory,Hamamatsu Photonics,Shizuoka,Japan;2.Solid State Laser for Astronomical Observation Research Team,The Institute of Physical and Chemical Research (RIKEN),Saitama,Japan |
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| Abstract: | We presented a Nd:YAG master oscillator power amplifier (MOPA) with the compact LD double-end pumped configuration. To acquire
the homogenous absorption distribution, a composite short Nd:YAG rod has been employed as the amplification medium and the
rod side was well polished to cause total internal reflection (TIR) at the internal wall of the rod. Because the axes of pump
LDs and the seed laser occupy the same position, it is relatively easy to obtain both the satisfied mode-matching efficiency
and the high absorption efficiency by using two stacked-LD modules. A seed laser, with the input energy of 15 mJ and the pulse
width of 46 ns, was amplified through the MOPA structure with the one-pass gain of about 1.2. We have not found any parasitic
oscillations from both ends of the amplifier rod until the total pump LD power reached 420 W. The proposed scheme is thought
to be useful in a multiple-pass MOPA system for high-average-power applications. |
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